Love is more unpredictable than the weather, and romantic attraction remains a mystery of human chemistry. These now-defunct and largely forgotten celebrity couples seemed like such unlikely pairings that their mere existence bewildered the masses. Some were tumultuous and short-lived, while others lasted years before going off the rails.

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From Emmy Rossum and Counting Crows' Adam Duritz to Drew Barrymore's mind-boggling marriage to comedian Tom Green, these romances prove that the heart wants what it wants — however odd it may seem to those on the outside looking in.